In Cognitive Radio (CR) networks, it is common that the spectrum holes are too narrow to
support high-speed communications. Discontinuous Orthogonal Frequency Division …

The low spectrum utilization has limited the development of wireless communication is a
common view In Cognitive Radio (CR). And the idle spectrum holes are too narrow to …

Cognitive radio has been introduced as a promising solution to the apparent problem of
spectrum scarcity by exploiting unused portions of spectrum. The available spectrum bands …

Contiguous spectrum assignment generates many small spectrum fragments that cannot be
fully utilized, which leads to low spectrum utilization. With the development of advanced …

Cognitive radio (CR) technology employing dynamic spectrum access (DSA) improves
spectrum utilization by exploiting its unused portions and provides a solution to the apparent …

Cognitive radios (CR) offer the promise of being a disruptive technology innovation that will
enable the future wireless world. CR techniques are being applied in many different …

With the development of Cognitive Radio networks, in order to fully utilize the scarce
spectrum resources, secondary users are capable of exploiting the available spectrum of …

Efficient spectrum utilization can be achieved in several ways, one of which is a better
spectrum access. In this paper we propose a subband adaptive filtering method for effective …

In this paper, we propose a utility-based spectrum aggregation algorithm to enhance the
performance of a cognitive radio network considering multiple objectives:(i) maximization of …

To achieve highly efficient and flexible spectrum sharing in cognitive radio networks, we
proposed a queuing method in combined channel aggregation and fragmentation (CAF) …